/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package a.gui.proguard.gui.splash;

import java.awt.*;
import java.awt.image.BufferedImage;

/**
 * This Sprite encapsulates another Sprite, which is then buffered in an Image.
 *
 * @author Eric Lafortune
 */
public class BufferedSprite implements Sprite {
    private final int bufferX;
    private final int bufferY;
    private final Image bufferImage;
    private final Color backgroundColor;
    private final Sprite sprite;
    private final VariableInt x;
    private final VariableInt y;

    private long cachedTime = -1;

    /**
     * Creates a new BufferedSprite with an ABGR image.
     * 
     * @param bufferX the x offset of the buffer image.
     * @param bufferY the y offset of the buffer image.
     * @param width the width of the buffer image.
     * @param height the height of the buffer image.
     * @param sprite the Sprite that is painted in the buffer.
     * @param x the variable x ordinate of the image buffer for painting.
     * @param y the variable y ordinate of the image buffer for painting.
     *
     */
    public BufferedSprite(int bufferX, int bufferY, int width, int height, Sprite sprite, VariableInt x,
        VariableInt y) {

        this(bufferX, bufferY, new BufferedImage(width, height, BufferedImage.TYPE_4BYTE_ABGR), null, sprite, x, y);
    }

    /**
     * Creates a new BufferedSprite with the given image.
     * 
     * @param bufferX the x offset of the buffer image.
     * @param bufferY the y offset of the buffer image.
     * @param bufferImage the Image that is used for the buffering.
     * @param backgroundColor the background color that is used for the buffer.
     * @param sprite the Sprite that is painted in the buffer.
     * @param x the variable x ordinate of the image buffer for painting.
     * @param y the variable y ordinate of the image buffer for painting.
     */
    public BufferedSprite(int bufferX, int bufferY, Image bufferImage, Color backgroundColor, Sprite sprite,
        VariableInt x, VariableInt y) {
        this.bufferX = bufferX;
        this.bufferY = bufferY;
        this.bufferImage = bufferImage;
        this.backgroundColor = backgroundColor;
        this.sprite = sprite;
        this.x = x;
        this.y = y;
    }

    // Implementation for Sprite.

    public void paint(Graphics graphics, long time) {
        if (time != cachedTime) {
            Graphics bufferGraphics = bufferImage.getGraphics();

            // Clear the background.
            if (backgroundColor != null) {
                Graphics2D bufferGraphics2D = (Graphics2D)bufferGraphics;
                bufferGraphics2D.setComposite(AlphaComposite.Clear);
                bufferGraphics.fillRect(0, 0, bufferImage.getWidth(null), bufferImage.getHeight(null));
                bufferGraphics2D.setComposite(AlphaComposite.Src);
            } else {
                bufferGraphics.setColor(backgroundColor);
                bufferGraphics.fillRect(0, 0, bufferImage.getWidth(null), bufferImage.getHeight(null));
            }

            // Set up the buffer graphics.
            bufferGraphics.translate(-bufferX, -bufferY);
            bufferGraphics.setColor(graphics.getColor());
            bufferGraphics.setFont(graphics.getFont());

            // Draw the sprite.
            sprite.paint(bufferGraphics, time);

            bufferGraphics.dispose();

            cachedTime = time;
        }

        // Draw the buffer image.
        graphics.drawImage(bufferImage, bufferX + x.getInt(time), bufferY + y.getInt(time), null);
    }
}
